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  • getpass for Jython

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    Posted on 21 November 2008 Sebastian Thomschke*/?> 1 comment

    In my current project I am developing some Jython based command line tools and had the need for masking passwords entered in the command shell. Python provides the getpass module for this purpose. Unfortunately this module has not been made available for Jython.

    Here comes a module I wrote to provide this kind of functionality. It uses the mechanism described here http://java.sun.com/developer/technicalArticles/Security/pwordmask/ to mask characters entered at the command prompt. Additionally if Java 6 or higher is running Jython the module will instead use the new Console.readPassword() method. In case the module is running in an environment where the getpass module is available it will delegate to the corresponding methods of this module instead of using its own implementations.

    # ext_getpass.py
    # @author Sebastian Thomschke, http://sebthom.de/
    import thread, sys, time, os
    
    # exposed methods:
    __all__ = ["getpass","getuser"]
    
    def __doMasking(stream):
        __doMasking.stop = 0
        while not __doMasking.stop:
            stream.write("b*")
            stream.flush()
            time.sleep(0.01)
    
    def generic_getpass(prompt="Password: ", stream=None):
        if not stream:
            stream = sys.stderr
        prompt = str(prompt)
        if prompt:
            stream.write(prompt)
            stream.flush()
        thread.start_new_thread(__doMasking, (stream,))
        password = raw_input()
        __doMasking.stop = 1
        return password
    
    def generic_getuser():
        for name in ('LOGNAME', 'USER', 'LNAME', 'USERNAME'):
            usr = os.environ.get(name)
            if usr: return usr
    
    def java6_getpass(prompt="Password: ", stream=None):
        if not stream:
            stream = sys.stderr
        prompt = str(prompt)
        if prompt:
            stream.write(prompt)
            stream.flush()
    
        from java.lang import System
        console = System.console()
        if console == None:
    	    return generic_getpass(prompt, stream)
        else:
            return "".join(console.readPassword())
    
    try:
        # trying to use Python's getpass implementation
        import getpass
        getpass = getpass.getpass
        getuser = getpass.getuser
    except:
        getuser = generic_getuser
    	
        # trying to use Java 6's Console.readPassword() implementation
        try:
            from java.io import Console
            getpass = java6_getpass
        except ImportError, e:
            # use the generic getpass implementation
            getpass = generic_getpass
    

    Here is an usage example:

    import ext_getpass as getpass
    
    pw = getpass.getpass("Please enter your password:")
    print "The entered password was: " + pw
    
     

    1 responses to “getpass for Jython” RSS icon

    • With Jython 2.5.1, I get an AttributeError on line 51. Since that block only handles the ImportError, the script was coughing-up a traceback. In my local copy, I’ve changed line 51 to read…

      except (ImportError, AttributeError), e:

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